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What does the pH of a solution measure?

  1. Volume

  2. Temperature

  3. Acidity or Alkalinity

  4. Density

The correct answer is: Acidity or Alkalinity

pH is a scale that measures the acidity or alkalinity of a solution. Option A, volume, is a measure of the amount of space that a substance or object occupies, and option B, temperature, is a measure of how hot or cold a substance or object is. Option D, density, is a measure of how much mass is contained within a given volume of a substance. None of these options directly relate to the concept of pH, which specifically measures the concentration of hydrogen ions in a solution. Therefore, options A, B, and D are incorrect.